陜西省森林生態(tài)系統(tǒng)生態(tài)化學(xué)計(jì)量特征
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圖片說明:陜西省森林樣點(diǎn)分布圖
[Abstract]:In order to clarify the relationship between the nutrient cycling between the plant and the soil of the forest ecosystem in Shaanxi Province, it is clear whether the characteristics of the overall ecological chemical measurement of the leaf and the tree layer are consistent, and the representative samples of the forest ecosystem in Shaanxi Province are selected as the research object. The method of field investigation and indoor analysis was used to study the contents of C, N and P in different arbor organs and soil, and the chemical measurement features and the relationship between the leaf, tree layer (leaf, branch, stem, root) and soil layer (0-100 cm) were analyzed. And the relationship between the content of the tree layer and the soil layer C, N, P and the chemical measurement characteristics of the tree layer and the soil layer and the geographic factors and the climatic factors. At the same time, the similarities and differences of the tree layer and the soil layer C, N, P content and their chemical measurement characteristics of the artificial forest and the natural forest ecosystem in different regions (northern Shaanxi, Guanzhong and southern Shaanxi) were analyzed. In addition, the tree layer and soil layer C and N of different species of Shaanxi (Leguminosae), Robinia pseudoacacia, Quercus liaotungensis, and pine (Pinus tabulaeformis) and Quercus variabilis (Quercus liaotungensis, Quercus variabilis, and Quercus acuminata) and the soil layers C, N, The difference of P content and its chemical measurement features and its similarity to geographic factors and climatic factors are analyzed and studied. The study can provide a theoretical basis for the construction and management of the plantation in Shaanxi Province, and enrich the C, N and P chemical measurement feature database in the northwest and even the whole country. The results showed that:1) The contents of C, N and P in the tree layer of the forest ecosystem in Shaanxi province were 452.23, 4.91 and 0.49 mg 路 g-1, respectively, while the contents of C, N and P in the vegetative organs of the plant were 466.28, 16.72 and 1.30 mg 路 g-1, respectively. The content of C, N and P of soil layer (0-100 cm) was 7.65, 0.74, 0.53 mg 路 g-1 respectively, and the content of C, N and P in surface soil (0-10 cm) was 21.73, 1.80, 0.56 mg 路 g-1, respectively. and the soil layer nutrient is scarce and is in a low-level equilibrium state.2) the relationship between the leaves of the forest ecosystem in the Shaanxi province, the tree layer and the soil is different, the content of the tree layer C and the average annual rainfall show a significant correlation, It is indicated that rainfall is one of the main factors that affect the growth state of the plant in Shaanxi Province.3) In the case of different regions, the ability of plant photosynthesis to fix C in the south of Shaanxi is stronger than that in the northern and central regions, and the content of the tree layer C is higher; the soil in the Guanzhong area is more fertile, and the soil layer N, P content is higher.4) For the artificial forest ecosystem, the organic matter decomposition of the northern part of the northern Shaanxi is fast, and the soil layer P is more effective, and for the natural forest ecosystem, although the decomposition rate of the organic matter in different regions is consistent, However, the efficiency of soil layer P in northern Shaanxi is also higher.5) For the artificial forest ecosystem, the utilization efficiency of the Platycladus orientalis in the northern Shaanxi is higher and the decomposition rate of the organic matter is higher, and the utilization efficiency of the Chinese pine in the Guanzhong area is the highest for the N and P. The decomposition rate of the organic matter of the Robinia pseudoacacia is the highest, the utilization ratio of the Pinus massoniana to the N and the P is higher, and the decomposition rate of the organic matter of the Chinese mountain pine is higher; for the natural forest ecosystem, the utilization efficiency of the plant to the P in the northern part of the northern Shaanxi is in the order of the Quercus, the Quercus liaotungensis and the Betula platyphylla, Betula platyphylla has a higher decomposition rate of organic matter, and the utilization efficiency of Quercus variabilis in Guanzhong area is higher, and the organic matter decomposition rate of Quercus variabilis and Quercus liaotungensis is higher, and the utilization rate of Quercus in the southern part of Shaanxi is the highest. The decomposition rate of organic matter is the same.6) Under the condition of N and P, Chinese pine has higher nutrient use efficiency, but the growth of Robinia pseudoacacia is fast. At the same time, the organic matter decomposition rate of the Robinia pseudoacacia forest ecosystem is fast, while the N, P and accumulation efficiency of the oil-forest ecosystem are higher. The growth rate of the tree species is basically the same, and the decomposition rate of the organic matter is also consistent, but the P-effectiveness and the accumulation efficiency of the Quercus variabilis are higher than that of the Quercus liaotungensis. The different species of Quercus liaotungensis have a certain proportion to the absorption of N and P elements in different species of Quercus liaotungensis. In the case of different species of tree species, the content of tree layer C of each tree species was significantly correlated with the average annual rainfall except for Pinus tabulaeformis, and the content of N, P and N: P in the arbor layer were not significantly correlated with the latitude except for Quercus liaotungensis. There was no significant correlation between the soil layer C and the average annual rainfall, either for the tree species of the different family or the same genus, but the soil layer C content and the average annual temperature of the other tree species were related to the average annual temperature except the Robinia pseudoacacia and the Quercus variabilis. The N content of soil layer was not related to the average annual precipitation and the average annual temperature except Pinus tabulaeformis.
【學(xué)位授予單位】:西北農(nóng)林科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:S718.5
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